If you see a math problem with one variable (letters) and one a number by itself, the anwar will always be the variable after the number you had answar like for EXAMPLE: 1x+1= 2x
should be 80, angle 50 is congruent on both sides to 50+50 equals 100. The triangle sum theorem says a triangle adds up to 180 degrees so we are left with 80, X=80 degrees
